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             AUSCERT External Security Bulletin Redistribution

                  ESB-2005.0446 -- IBM SECURITY ADVISORY
    A local user may gain root privileges through the perl interpreter.
                               14 June 2005

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           perl
Publisher:         IBM
Operating System:  AIX 5.3
                   AIX 5.2
Impact:            Root Compromise
                   Execute Arbitrary Code/Commands
Access:            Existing Account
CVE Names:         CAN-2005-0156 CAN-2005-0155

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IBM SECURITY ADVISORY

First Issued: Mon Feb 14 13:26:10 CST 2005

|Updated : Fri Feb 25 09:57:19 CST 2005
| New AIX 5.2 efix package eliminates issue with multi-processor machines.
| Added APAR information 
|Updated : Fri Jun 10 15:19:40 CDT 2005
|  Remove interim fix and workaround information

==========================================================================
                           VULNERABILITY SUMMARY

VULNERABILITY:      A local user may gain root privileges through the
                    perl interpreter.

PLATFORMS:          AIX 5.2, AIX 5.3

|SOLUTION:           Apply APARs as described below.

THREAT:             A local user may gain root access to a system.

CERT VU Number:     None.
CVE Number:         CAN-2005-0155, CAN-2005-0156
==========================================================================
                           DETAILED INFORMATION


I.  Description
===============

Two vulnerabilities were discovered in the perl language interpreter that
may allow a local user to gain root privileges. The perl interpreter is
installed by default in AIX 5.2 and AIX 5.3. Versions of AIX prior to 5.2
do not have perl installed by default and are not vulnerable. Also, these
vulnerabilities occur only in perl with versions 5.8.0 through 5.8.6.

CAN-2005-0155
The first vulnerability is through the sperl program which runs perl as an
suid root process. This perl facility is not installed by default on AIX,
but the same vulnerability may exist if perl is invoked by another suid
root program.

CAN-2005-0156
The second vulnerability is in the perl interpreter itself and is a buffer
overflow. This is only specific to perl built with threads support, which
is supported in the AIX perl package.

The perl language ships in the perl.rte filesets. To determine if this
fileset is installed, execute the following command:

# lslpp -L perl.rte

If the fileset is installed, it will be listed along with its version
information, state, type and a description.


II. Impact
==========
A local attacker may gain root access to a system.


III.  Solutions
===============

A. Official Fix

|IBM will provide the following fixes:
|
|APAR number for AIX 5.2.0: IY68464  (currently available)
|APAR number for AIX 5.3.0: IY68463  (currently available)
|
|NOTE: Affected customers are urged to upgrade to 5.2.0 or
|5.3.0 at the latest maintenance level.


| Updated: Fri Jun 10 15:19:40 CDT 2005
| Removed interim fix and workaround information.


IV. Obtaining Fixes
====================
AIX Version 5 APARs can be downloaded from:

     http://www-1.ibm.com/servers/eserver/support/pseries/aixfixes.html


Security related Emergency Fixes can be downloaded from:

     ftp://aix.software.ibm.com/aix/efixes/security


V. Acknowledgments
====================

The perl vulnerabilities were discovered by Kevin Kinisterre.

This issue was brought to our attention by Campo Weijerman of
IBM Netherlands.

This document was written by Kent Stuiber.


VI.  Contact Information
========================

If you would like to receive AIX Security Advisories via email, please
visit:
     https://techsupport.services.ibm.com/server/pseries.subscriptionSvcs

Comments regarding the content of this announcement can be directed to:

     security-alert@austin.ibm.com

To request the PGP public key that can be used to communicate securely
with the AIX Security Team send email to security-alert@austin.ibm.com
with a subject of "get key". The key can also be downloaded from a
PGP Public Key Server. The key id is 0x9391C1F2.

Please contact your local IBM AIX support center for any assistance.

eServer is a trademark of International Business Machines Corporation.
IBM, AIX and pSeries are registered trademarks of International Business
Machines Corporation. All other trademarks are property of their
respective holders.

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